<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .parent{
            width: 200px;
            height:200px;

            background-color: #ff8500;
        }
        .child{
            width:50px;
            height:50px;
            background-color: darkred;
            left:10px;
            top:10px;
        }

    </style>
</head>
<body>
<div class="parent">
    <div class="child"></div>
</div>
</body>
</html>